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Which card do you have again? I seem to remember it was one of the slowest r600g cards.

No, it's actually one of the fast flagship cards of that generation. HD4870. I have already tried every tweak mentioned here long ago. Nothing helps. KWin after KDE 4.5 was getting slower and slower. Disabling KDE's VSync in systemsettings and setting vblank_mode to 0 helped a bit, but not much.

KWin's performance in recent versions is really crappy on my system. I once tried Compiz with KDE, but the integration sucks.

In order to get the most out of these releases, we strongly recommend to use the latest version of Qt, as of today 4.7.4. This is necessary in order to assure a stable experience, as some improvements made to KDE software have actually been done in the underlying Qt framework.

In order to make full use of the capabilities of KDE's software, we also recommend to use the latest graphics drivers for your system, as this can improve the user experience substantially, both in optional functionality, and in overall performance and stability.

If you are having a poor experience, and you are unable to meet the system requirements of KDE SC 4.7, then the easiest interim solution might be to change the desktop rendering backend to Xrender.

For other readers, for some balance ... KDE SC 4.7 is a fantastic experience for some users:

save yourself some pain, use the ati provided drivers.
the open source drivers are hit and miss.

i just wish ati would release an updated driver to support 10.04 '$ graphics stack.
for r300

Originally Posted by RealNC

No, it's actually one of the fast flagship cards of that generation. HD4870. I have already tried every tweak mentioned here long ago. Nothing helps. KWin after KDE 4.5 was getting slower and slower. Disabling KDE's VSync in systemsettings and setting vblank_mode to 0 helped a bit, but not much.

KWin's performance in recent versions is really crappy on my system. I once tried Compiz with KDE, but the integration sucks.

I don't know if it helps, but it seems as if though disabling compatibility checks under the desktop config section not only gave me blur when everyone was crying that it didn't work with FLOSS (on Fedora with a HD5770 and HD5470), but everything went crash-free fast.